Let's get this math done. We have 187 and we're going to multiply it by 15. This is the same as taking 187 and adding it to itself 15 times.
Step 1: 0 + 187 = 187
Step 2: 187 + 187 = 374
Step 3: 374 + 187 = 561
Step 4: 561 + 187 = 748
Step 5: 748 + 187 = 935
Step 6: 935 + 187 = 1122
Step 7: 1122 + 187 = 1309
Step 8: 1309 + 187 = 1496
Step 9: 1496 + 187 = 1683
Step 10: 1683 + 187 = 1870
Step 11: 1870 + 187 = 2057
Step 12: 2057 + 187 = 2244
Step 13: 2244 + 187 = 2431
Step 14: 2431 + 187 = 2618
Step 15: 2618 + 187 = 2805

So, 187*15 = 2805